Inspection Procedure

1. Check that the stop lights come on when the brake pedal is depressed, and go off when the brake pedal is released.

   OK 

   ILLUMINATION CONDITION CHART
   
   

   Condition	Illumination Condition
   Brake pedal depressed	ON
   Brake pedal released	OFF

NG: GO TO PROBLEM SYMPTOMS TABLE (STOP LIGHT SYSTEM)  (See PROBLEM SYMPTOMS TABLE )

OK: Go to next step 

1. Turn the engine switch off.
2. Remove the BRK-LP relay from the engine room No. 3 relay block.
3. Measure the resistance according to the value (s) in the table below

   Standard Resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   3 - 5	Voltage is not applied between terminals 1 and 2	10 kΩ or higher
   3 - 5	Voltage is applied between terminals 1 and 2	Below 1 Ω
   3 - 4	Voltage is not applied between terminals 1 and 2	Below 1 Ω
   3 - 4	Voltage is applied between terminals 1 and 2	10 kΩ or higher

   Fig 1: Identifying BRK-LP Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE BRK-LP RELAY 

OK: Go to next step 

1. Measure the voltage according to the value (s) in the table below.

   Standard Voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   BRK-LP relay terminal 5 - Body ground	Always	11 to 14 V
   BRK-LP relay terminal 2 - Body ground	Engine switch on (IG)	11 to 14 V
   BRK-LP relay terminal 2 - Body ground	Engine switch off	Below 1 V

Fig 2: Identifying BRK-LP Relay
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the connector from the skid control ECU.
2. Measure the resistance according to the value (s) in the table below.

   Standard Resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   A35-21 (STPO) - BRK-LP relay terminal 1	Always	Below 1 Ω
   A35-21 (STPO) - Body ground	Always	10 kΩ or higher

Fig 3: Identifying BRK-LP Relay
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the connector from the stop light control relay.
2. Measure the resistance according to the value (s) in the table below.

   Standard Resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   A35-20 (STP2) - J96-2 (STP)	Always	Below 1 Ω
   A35-20 (STP2) - Body ground	Always	10 kΩ or higher

Fig 4: Identifying Terminals Of Stop Light Control Relay
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE SKID CONTROL ECU  (See SKID CONTROL ECU )